a; 不填
8. When you finish reading this book, you will have ________ better understanding of ________ life. 
A. a, the                                  B. the, a
C. /, the                                   D. a, /
9. It is ________ world of wonders ________ world where anything can happen.
A. a, the                                  B. a, a
C. the, a                                  D. 不填, 不填
10. The most important thing about cotton in history is ________ part that it played in ________ Industrial Revolution.
A. 不填；不填                        B. the；不填
C. the; the                               D. a; the
11. While he was investigating ways to improve the telescope, Newton made ________ discover which completely changed ________ man’s understanding of colour.
A. a…不填                              B. a…the
C. 不填…the                            D. the…a
12. —I’d like ________ information about the management of your hotel, please.
—Well, you could have ________ word with the manager. He might be helpful.
A. some, a                                B. an, some
C. some, some                           D. an, a
13. Many people agree that ________ knowledge of English is a must in ________ international trade today.
A. a; /                                        B. the; an
C. the; the                                  D. /；the
14. —Have you seen ________ pen? I left it here this morning.
—Is it ________ black one? I think I saw it somewhere
A. a; the                                      B.